| Fort Carson to Orbetello | 5,543.33 mi (8,921.12 km) |
| Fort Carson to Oria | 5,868.94 mi (9,445.15 km) |
| Fort Carson to Oristano | 5,566.96 mi (8,959.16 km) |
| Fort Carson to Orta Nova | 5,759.14 mi (9,268.44 km) |
| Fort Carson to Orte | 5,584.64 mi (8,987.61 km) |
| Fort Carson to Ortona | 5,661.60 mi (9,111.46 km) |
| Fort Carson to Orvieto | 5,562.11 mi (8,951.34 km) |
| Fort Carson to Orzinuovi | 5,355.37 mi (8,618.63 km) |
| Fort Carson to Osimo | 5,572.99 mi (8,968.85 km) |
| Fort Carson to Ospitaletto | 5,352.91 mi (8,614.68 km) |
| Fort Carson to Ostuni | 5,855.12 mi (9,422.91 km) |
| Fort Carson to Ottaviano | 5,739.66 mi (9,237.10 km) |
| Fort Carson to Ovada | 5,345.42 mi (8,602.62 km) |
| Fort Carson to Ozieri | 5,550.41 mi (8,932.51 km) |
| Fort Carson to Paceco | 5,811.62 mi (9,352.90 km) |
